JPS62203889A - Speed change driving device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a speed change operation device mainly used for bicycles, and more specifically, a lever body is rotatably supported on a fixed member fixed to a bicycle frame, etc. The present invention relates to a speed change operating device that operates a transmission through a rotational operation to change gears to a predetermined gear position.

(Prior Art) Conventionally, in a bicycle gear shift operation device in which a lever body for operating a transmission is rotatably supported on a fixed member, the lever body rotates in conjunction with the lever body and changes the gear position of the transmission. A positioning mechanism including a positioning body to be set and an engaging body fixed to the fixed member and engaged with the positioning body, and a lever body that provides rotational resistance against the return spring of the transmission. It is known to have a frixine mechanism that gives the same effect.

By the way, the present applicant first provided a positioning body in the positioning mechanism with a plurality of engaging portions that engage with the engaging body;
Flixiron portions are disposed in parallel in a direction perpendicular to the rotational center line of the lever body, and the engaging body is displaced in a direction perpendicular to the rotational center line of the lever body to prevent the engagement of the engaging body. Providing an operating body that releases the engagement with the coupling portion and causes the engagement body to engage the friction portion,
We have proposed a structure in which a gap is provided in the interlocking part between the lever body and the positioning body. (Patent Application No. 5EE82) By the way, this Hff operates the positioning mechanism to change gears, or switches the positioning mechanism to a non-operating state and applies rotational resistance to the lever body to change gears. When the lever body is moved forward against the return spring of the transmission in the operating configuration of the positioning mechanism, the lever body is rotated excessively by a predetermined amount or more, and the chain guide tool of the transmission is moved into multiple stages. After the sprocket in the sprocket device is overshifted from the center line in the width direction to change gears, the lever body is moved back by the clearance amount relative to the operation amount of the lever body, and the lever body is rotated. When the lever body is operated forward while applying dynamic resistance, the lever body is held at the operated position regardless of the gap, and,
The positioning body rotates with a delay of the gap amount relative to the lever body.

(Problem to be Solved by the Invention) However, in the case of this Wiff, the engagement of the engagement body with the engagement portion is released by operating the operating body, and the engagement body is engaged with the frixibon portion. to give the lever body a rotational resistance (R) that opposes the force (F) of the return spring, and when used in the Flixiron system, a large rotational resistance is applied to the lever body by the operation of the operating body. (R1) and the small rotational resistance (R2) that occurs between the positioning body and the operating body becomes the rotational resistance (R). The rotation resistance (R2
) is sufficiently larger than the return spring force (F), there is no problem, but if the operation amount of the operating body is insufficient than the appropriate operation amount, the rotation resistance (R1) becomes larger than the return spring force (F). F)
If it is slightly larger or even slightly smaller, the lever body may unexpectedly return to the positioning body by the gap due to the restoring force of the return spring of the transmission due to vibrations while riding the bicycle. As a result, when operating the lever body to rewrite the chain, depending on the operating state of the lever body, the rewritten chain may be automatically rewritten to another adjacent sprocket. there were. That is, when the lever body is not over-rotated by a predetermined amount or more, when the lever body returns by the gap amount, the operating amount of the lever body decreases to the predetermined amount or less, and the chino is automatically rewritten. It will become.

An object of the present invention is to reliably prevent the lever body from moving back unexpectedly by the above-mentioned clearance amount when switching to the Flixiron system.

(Means for solving the problem) The present invention provides a fixing member (1) and a fixing member (1).
1), a lever body (2) that rotatably supports the lever body (2), a positioning body (31) that rotates in conjunction with the lever body (2) and sets the gear position of the transmission, and the positioning body (31). a positioning mechanism (3) consisting of an engaging body (32) to be engaged;
and a friction body (4) that provides rotational resistance to the lever body (2) against a return spring of the transmission,
A gap (K) is provided in the interlocking part between the lever body (2) and the positioning body (31), while the positioning body (31) and the flexible 37 body (4) are connected to the center line of rotation of the lever body (2). are disposed in parallel in a direction perpendicular to The positioning body (3) is displaced in a direction perpendicular to
1) and a switching means for engaging the engaging body (32) with the friction body (4).

(Function) When the lever body (2) is rotated when the positioning mechanism (3) is in the operating state, the lever body (2)
), the gear can be shifted by over-rotating by the amount of the clearance (K), and after the forward operation, the lever body (2) is rotated against the positioning body (31) by the restoring force of the return spring of the transmission. The gap (K) ffl is returned to its original position, and the positioning body (3
1) and the engagement body (32) is engaged with the friction body (4) to convert to the friction body, the positioning body (31) is free with respect to the engagement body (32). The lever body (2) becomes rotatable and the rotational resistance acting on the lever body (2) acts directly on the lever body (2) without bypassing the positioning body (31). It is possible to reliably prevent unforeseen return movements.

(Example) The speed change operation device shown in Fig. 1 has a cylindrical lever shaft (11
), a lever body (2) rotatably supported on the lever shaft (11), and a lever body (2) that rotates in conjunction with the lever body (2) to change the gear position of the transmission. A positioning mechanism (3) consisting of a positioning body (31) to be set and an engaging body (32) that engages with the positioning body (31), and a lever body ( 2), and the fixing member (1) includes a boss part (12) fixed to the bicycle frame by welding, and a friction body (4) that provides friction to the bicycle frame.
) and the lever shaft (11) protrudes outward from one end surface of the lever shaft (11). )
includes a support shaft (61), a large diameter shaft (62) continuous to the support shaft via a step, and a medium diameter shaft (62) continuous to the large diameter shaft via a step. a cylindrical fixed bushing (63), and a small diameter shaft part (64) which is continuous with the medium diameter shaft part via a stepped part and has a thread on its outer circumferential surface and an uneven strip extending in the axial direction; 6), and the inner surface of the fixed bush (6) on the large diameter shaft side is non-rotatably fitted to the lever shaft (11).

The lever body (2) includes a cylindrical boss portion (21) having a through hole and an operating portion (not shown) extending radially outward from the negative side of the boss portion (21). A fitting portion that fits into the support shaft portion (61) is provided at one end opening of the through hole.

Further, the positioning body (31) of the positioning mechanism (3) has a plurality of engaging portions (31) corresponding to the gear positions of the transmission.
a) is provided, and the engaging body (32) is engaged with one of the engaging portions (31a). Moreover, the positioning body (3
1) is rotatably supported on the medium diameter shaft portion (63), and the engaging body (32) is supported on the fixed bush (6) via a holder (7). Also, this engaging body (3
2) and the fixed bush (6) is interposed a pressing spring (8) that biases the engaging body (32) toward the positioning body (31).

Further, the positioning body (31) is provided with a plurality of engagement protrusions (31b) on the outer circumferential surface of one end thereof.
An engagement recess (21a) that engages with the positioning body (3lb) is provided on the inner circumferential surface of the through hole of the boss (21).
1) is interlocked with the rotation of the lever body (2), and as shown in FIG. The lever body (2) is rotated relative to the positioning body (31).
), the lever body (2) is overshifted during the forward movement of ) f
The lever body (2) is freely moved backward relative to the positioning body (31) by an amount equivalent to the gap (K) relative to the forward operation amount, leaving a gap (K) for backward movement corresponding to fl. As (has become)

Therefore, in the embodiments shown in FIGS. 1 to 9, the friction body (4) is formed separately from the positioning body (31), and these positioning body (31) and friction body (4)
are arranged in parallel in a direction orthogonal to the rotational center line of the lever body (2), so that the flexible body (4) is supported on the end surface of the boss portion of the lever body (2), and The combination (32) is displaced in a direction perpendicular to the rotation center line of the lever body (2) to release the engagement with the positioning body (31), and the engagement body (32) is moved to the friction body (4). ) is provided.

In the above configuration, the friction body (4) is arranged radially outward of the positioning body (31), and the friction body (4) is arranged radially outward of the positioning body (31).
It consists of an annular plate having a through hole with a larger diameter than the outer diameter of 1), the surface of which is inclined so that it becomes thinner from the outer circumferential edge to the inner circumferential edge, and a V-shaped cross section is formed on this inclined surface. Friction 1it ((41)) consisting of uneven stripes is provided over the entire circumferential surface.

Further, an annular receiving surface is provided on the end surface of the boss portion (21) of the lever body (2) that supports the friction body (4),
On this annular receiving surface, the above-mentioned flexible body (4) is supported, and the flexible body (4) and the boss portion (21) are supported.
A fitting protrusion is provided on one side of the friction body (4), and a fitting opening portion that engages with the fitting protrusion is provided on the other side.
rotation relative to the lever body (2) is prevented.

Further, the engaging portions (31a) of the positioning body (31) are provided at predetermined intervals in the circumferential direction, and the engaging body (32) uses a ball, but may also use a roller. Alternatively, as described later, it may be formed in a shape other than a rolling element.

The holder (7) that holds the engaging body (32) is made of a disc having a fitting hole that non-rotatably fits into the small diameter shaft (64). As shown in FIG. 4, a holding hole (71) extending in the radial direction and a relief hole (72) extending in the circumferential direction are provided, and the engaging body (32) is inserted into the holding hole (71). 7) is held movably in the radial direction.

Further, the pressing spring (8) that urges the engaging body (32) is
It consists of a disc-shaped leaf spring with a fitting hole that non-rotatably fits into the old small diameter shaft part (64), and this pressure spring (8) has a
As shown in FIG. 6, a relief hole (81) extending in the circumferential direction is provided.

The switching means also includes a guide body (91) that engages with the engaging body (32) and displaces the engaging body (32) in the radial direction of the holding body (7); an operating body (92) for operating the guide body (91);
consists of an annular plate having a guide portion (91a) extending radially outward in the circumferential direction from a portion facing the engagement body (32), and this guide body (91) is connected to the small diameter shaft portion ( 64), and is non-rotatably supported via a spacer (93) which is non-rotatably fitted to the small diameter shaft portion (64). Further, this guide body (91) is provided with a locking hole (9lb).

Further, the operating body (92) has the small diameter shaft portion (64),
The operating body (92) is rotatably supported via a fixed nut (10) screwed onto the small diameter shaft (64).
) of the guide body (91).
) is provided with a transmission arm (92a) that fits into the operating body (
92) is transmitted to the guide body (91).

Further, the operating body (92) is movable in the axial direction with respect to the fixing nut (10), and between the operating body (92) and the fixing nut (10), the operating body (92) is movable in the axial direction. A dog clutch (20) facing the dog clutch (20) is provided, and a clutch spring (30) is provided which biases the operating body (92) in a direction in which the dog clutch (20) is always engaged.

As shown in Fig. 7.8, this clutch spring (30) consists of a plate spring having a fitting hole that non-rotatably fits into the small diameter shaft gl ((84), 2
0) consists of a mesh y having a V-shaped cross section and provided around the axially opposing surfaces of the operating body (92) and the fixed nut (10).

Note that the illustrated speed change operation v2 position is based on the positioning body (31
) and the fixing member (1), the positioning body (3
1) in a direction opposite to the direction in which the return spring of the transmission is biased.
0) makes it possible to reduce the operating force required for forward movement of the operating lever (2).

Further, in the figure (50) is a mounting screw that is screwed into the threaded hole of the lever shaft (11), (94) is a substantially C-shaped handle provided on the operating body (92) so as to be able to raise and lower it, and (60) is a synthetic resin cup, (70) is a tone plate, and (100) is a washer.

Further, the fixed bush (6), the lever body (2), the positioning body (31), the engaging body (32), and the pressing spring (8
), the holding body (7), the friction body (4), the operating body (92), the guide body (91), the spacer (93) and the clutch spring (30), the fixing nut (10) It is made into a unit by screwing into the bush (6).

The present invention is constructed as described above, and has a positioning mechanism (3
), the engaging body (32) is engaged with any one of the engaging portions (31a) of the positioning body (31) as shown in FIG. When the lever body (2) is rotated in the state shown in FIG. 1, the lever body (2) freely rotates against the return spring of the transmission with respect to the positioning body (31) by the gap (K). , the engagement recess (21a) and the engagement protrusion (31
b) are engaged, and the lever body (2) and the positioning body (31
) are integrated.

Then, when the lever body (2) is further operated forward,
The positioning body (31) rotates with the lever body (2) relative to the engagement body (32) by an amount corresponding to the pitch between the respective engagement portions (31a), and the lever body (2) rotates with respect to the gap. This results in over-rotation by (K)m. Due to this excessive rotation, the chino guide of the transmission overshifts each sprocket in the multi-stage sprocket device, and the chino guided by the chino guide is replaced with a desired sprocket.

Next, when the operating force of the lever body (2) is released, the lever body (2) freely moves back to the positioning body (31) by an amount equivalent to the gap (K) due to the restoring force of the return spring. However, it is held at the proper position set by the positioning mechanism (3). Further, the chino guide also moves backward in accordance with the amount of free backward movement of the lever body (2), and stops at an appropriate position relative to the desired sprocket.

Next, when applying rotational resistance to the lever body (2) against the return spring of the transmission from the operating system of the positioning mechanism (3), push the operating body (92) in FIG. The operating body (92) is moved in the axial direction with respect to the fixed lever (10), the dog clutch (20) is disengaged, and the operating body (92) is rotated in one direction. Due to the rotation of the operating body (92), the rotation force is transmitted to the transmission arm (
92a) to the guide body (91), the guide body (91) rotates together with the old operating body (92), and as the guide body (91) rotates, the engagement body (32) is displaced radially outward of the positioning body (31) along the guide F1f= (91a) of the guide body (91), and the engagement body (32) engages with the engagement EVa (3L a). is separated and the positioning body (31) can freely rotate within the gap (K) relative to the engagement body (32), while the engagement body (32) is separated from the friction part (41) of the friction body (4). ), and as a result of this engagement, rotational resistance (R) is applied to the lever body (2) via the friction body (4) against the force (F) of the return spring in the transmission. It is granted. In this case, the rotational resistance acting on the lever body (2) does not bypass the positioning body (31), and the friction body (2) supported on the lever body (2)
4), so the lever body (2) will not unexpectedly move back by the gap (K) ffl due to vibrations when riding the bicycle. .

Note that the operating body (92) is rotated after the rotational operation.
2), the force of the clutch spring (30) causes it to move back in the axial direction, and this back movement of the operating body (92) engages the dog clutch (20), causing the operating body (92) to move back in the axial direction.
) is prevented from rotating.

In addition, when switching from the system in which a predetermined rotational resistance is applied to the lever body (2) to the system in which the positioning mechanism (3) operates as described above, the operating body (92) is pushed and the dog clutch is activated. (20) and rotates the operating body (92) in the opposite direction, the operating body (92)
Due to the rotation, the engaging body (32) is displaced inward in the radial direction of the positioning body (31) along the guide portion (91a) of the guide body (91), and the friction body of this engaging body (32) (4) is disengaged, and the engaging body (32) engages with any one of the engaging portions (31a).

In the embodiment described above, the positioning body (31) that rotates in conjunction with the lever body (2) has a structure having a plurality of engaging portions (31a) corresponding to the gear positions of the transmission. , there is no other engaging part (31a), and this engaging part (3
A structure having one rolling element may be used instead of 1a), and the structure is not particularly limited. In short, any structure may be used as long as it can rotate in conjunction with the lever body (2) and set the gear position of the transmission. Further, when the positioning body (31) has a structure having rolling elements, the engaging body (32) is provided with a plurality of engaging portions corresponding to the gear positions of the transmission.

Furthermore, in the embodiments shown in FIGS. 1 to 9, the engaging body (
32) in a shape other than the rolling element, for example, the first
It is constructed as shown in Figures 0 to 12.

What is shown in FIGS. 10 to 12 is the engagement body (32
), a pair of claw bodies (320) having an engaged part that engages with the engaging part (31a) are used.
) is held in a holding part (80a) of a disc-shaped pressure spring (80) having a semi-cylindrical holding part (80a) extending in the radial direction so as to be displaceable along the holding part (80a). ,
These claw bodies (320) are provided on the outside of each of the claw bodies (320).
a ring spring (33) that urges the pressing spring (80) inward in the radial direction, the operating body (92)
) is configured to displace the claw body (320) in a direction perpendicular to the rotation center line of the lever body (2).

In addition, in the case of this embodiment, the holding body (7) and the guide body (
91) is rotatably supported on the medium diameter shaft portion (63) of the bush (6). Further, the cup (60) made of synthetic resin is configured to be elastically deformable in the axial direction by providing a thin wall portion in the middle thereof, and the cup (60) is provided with a thin wall portion in the middle thereof so as to be elastically deformable in the axial direction.
A support piece (80a) is provided in contact with the axial end face of the cup (92), so that the dog clutch (20) is brought into engagement by the elastic force of the cup (60).

In the case of the embodiment shown in FIGS. 10 to 12, the guide body (91) protrudes in the axial direction on the opposing surface of the guide body (91) and the pressing spring (80), and the guide body (91) ), and when the operating body (92) is rotated, the engaging protrusions are engaged with each other and the pressing spring (80) is rotated. The nail body (
320) in a direction away from the claw body (320).
It is preferable to reduce the load acting on the claw body (320) so that the claw body (320) can be easily displaced.

Further, when a rolling element is used as the engaging body (32) as shown in FIG. 1, for example, the engaging body (32) of the pressing spring (80)
By providing a semi-cylindrical holding part extending in the radial direction at the part facing the holder (2) and holding the engaging body (32) in this holding part, the holding part (7) can be made unnecessary. It is.

Further, although the dog clutch (20) is provided as a means for maintaining the rotational operation position of the operating body (92) constituting the switching means, other means, such as the handle (92) of the operating body (92), are provided.
4), the r1 edge of this handle (94) is sharpened, and this edge side penetrates the operating body (92) and protrudes into the inner surface of the operating body (92). The outer periphery of the nut (10) or the outer periphery of the washer (100),
Alternatively, the handle (
A concavo-convex strip that engages with the sharp end edge of 94) may be provided around the periphery.

In this case, the operating body (92) is provided with a cam surface that expands the diameter of the handle (94) when the handle (94) is operated to raise or lower, and when the operating body (92) is rotated, the handle ( 94
) may be disengaged from the engagement of the sharp end edge with the uneven strip.

Further, when the dog clutch (20) is provided, the synthetic resin cup (30) is replaced with the clutch spring (30).
60), and insert the operating body (60) into this cup (60).
An elastically deformable support piece is provided in contact with the axial end surface of the dog clutch (92), and the elastic force of this support piece causes the dog clutch (
20) may be made to mesh with each other.

Further, the operating body (92) has an operating position where the engaging body (32) is engaged with the engaging portion (31a), and a flexible bone g.
Engagement recesses are provided at two locations with the operation position engaged with (41), and an engagement protrusion that selectively engages with one of these engagement recesses is provided so that the operation can be performed only at the two locations. Body (92
) may be configured to maintain the operating position.

Further, the guide portion (91a) of the guide body (91) constituting the switching means is provided with a plurality of recesses that engage with the engaging body (32), so that rotational operation of the operating body (92) is possible. At the same time, it may be possible to create a feeling of rippling.

Further, the guide portion (91a) is formed, for example, by a long hole having an inner guide surface and an outer guide surface, and is configured to move the engaging body (32) from the position where it is engaged with the engaging portion (31a). "When displacing the engaging body (32) to a position where it engages with the engagement part (41), the engaging body (32) is guided by the inner guide surface,
Further, when displacing the engaging body (32) from the position where it engages with the friction part (41) to the position where it engages with the engaging part (31a), the engaging body (32) is guided by the outer guide surface. You can do it as you like. In this case, the recessed portions are provided on the inner guide surface and the outer guide surface, and the operating body (92)
A click feeling may be felt when rotating in any direction, and the terminal end of the inner guide surface (the position where the engaging body (32) engages with the friction 3 flap part (41)) , the terminal end of the outer guide surface (the engaging body (32) is the engaging part (
A recessed portion that engages with the engaging body (32) is provided only at two locations, the position where the positioning mechanism (31a) engages with the positioning mechanism (31a).
) and the friction mechanism (4) may be configured to be able to reliably sense that one of them is in the operating state.

In addition, in the above explanation, the switching means has a structure with a rotatable operating body (92), but other lever bodies (5
) may have a structure having an operating body movable in a direction orthogonal to the rotation center line, and the structure is not particularly limited.

(Effects of the Invention) As described above, according to the present invention, when the positioning mechanism (3) is in the operating state, the lever body (2) can be rotated excessively by a predetermined amount or more to change gears, and the lever body ( 2), and a 717267 body (4) that provides rotational resistance to the lever body (2) against the return spring of the transmission. engaging bodies (2) disposed in parallel in a direction orthogonal to the rotational center line of the members (2) to support the Flixiron body (4) together with the Lenoy body (2) and engaging with the positioning body (31);
32) in a direction perpendicular to the rotation center line of the lever body (2) to release the engagement with the positioning body (31), and move the engaging body (32) to the Flixiron body (4).
) is provided, so when the switching means engages the engaging body (32) with the flixilon body (4) to establish the flixillon system, the renoi integral (
The rotational resistance acting on the lever body (2) can be applied directly to the lever body (2) without bypassing the positioning body (31). Gap (K) fflIt is possible to reliably prevent unexpected double movement.

Therefore, the check 7 is not automatically rewritten to another adjacent sprocket.

[Brief explanation of drawings]

FIG. 1 is an enlarged vertical sectional view showing one embodiment of the device of the present invention, FIG. 2 is a cross-sectional view of the positioning body portion, FIG. 3 is a cross-sectional view of the interlocking part between the lever body and the positioning body, and FIG. The figure is a plan view showing the relationship between the engaging body and the holding body, FIG. 5 is a plan view showing the relationship between the engaging body and the guide body, FIG. 6 is a plan view of only the pressure spring, and FIG. 7 is a plan view of only the clutch spring. 8 is a front view of the same, FIG. 9 is an enlarged cross-sectional view with some parts omitted when the system is switched to the friction system, and FIGS. 10 to 12 show another embodiment. FIG. 10 is an enlarged sectional view with a part omitted, FIG. 11 is a perspective view of only the engaging body, and FIG. 12 is an enlarged sectional view with a part omitted, showing a state switched to the flexible tandem system. (1)...Fixing member (2)...Lever body (3)...Positioning mechanism (31)...Positioning body (32)... ...Engagement body (4) ...Flexi type 7 body (K) ...Gap hυ, ゛Figure 1 II / Ward entrance [-

Claims (1)

[Claims] A fixed member (1), a lever body (2) that rotatably supports the fixed member (1), and a positioning body that rotates in conjunction with the lever body (2) and sets the gear position of the transmission. (3
1) and an engaging body (32) that engages with the positioning body (31).
); and a friction body (4) that provides rotational resistance to the lever body (2) that opposes the return spring of the transmission, the lever body (2) and the positioning body (31), and the positioning body (31) and friction body (4) are arranged in parallel in a direction orthogonal to the rotation center line of the lever body (2). to support the friction body (4) on the lever body (2) and to support the engagement body (32).
disengages from the positioning body (31) by displacing the lever body (2) in a direction perpendicular to the rotational center line of the lever body (2), and engages the engaging body (32) with the friction body (4). What is claimed is: 1. A speed change operation device, characterized in that it is provided with a switching means for switching.